Charles l



C. L. AND H. L. KRUM. PRlNTlNG TELEGRAPH. APPLICATION HLEU- um: 29. 1912.

Patented May 27, 1919.

UNITED STATES PATENT OFFICE.

CHARLES L. KRUM AND HOWARD L. KRUM, OF CHICAGO, ILLINOIS, ASSIGNORS TO MORKRUM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION.

PRINTING-TELEGRAPH.

To all whom. it may con Wu Be it known that I, Cumulus ll. Kiwi: and I'IUWARD L. KRUM, citizens of the United States, and residents of Chi ago, county of Cook, and State of Illinois. have invented certain new and useful Improven'ients in Printing-Tclegraphs, of whi h the following is a specifi ation.

The present applicatitm is a. division of an earlier application filed by us in the United States Patent Office November 29, W09, Serial No. 530,455.

The present iinpro ei'ncnt relates to printing telegraphs and more particularly to receivers for printing telegraphs and seeks to provide improved means whereby a char-- acter signal may be received at the time the character correspontjliug to a preceding v ignal is being printed.

The invention consists in the features of improvement hereinafter set forth, illustrated diagrannnatieally in the accompanying drawing, and more particularly pointed out in the appended claims.

The drawing illustrates diagrammatically the circuits and apparatus of the improved receiver.

line conductor 1?) extends from the di-'- tant station through opposed coils 14 of a. line relay R. A branch of a conductor 19 extends from a local battery 20 through another pair of opposed coils 22 of the line relay R to ground. The coils 22 balance each other and normally hold the relay armature r in central position between two contacts 24. The characters are represented by permutations of a definite number of line impulses of opposite polarity and, in accordance with the preferred plan, each character or complete signal is represented by a particular permutation of 5 positive and negative impulses. A line impulse passing through the coils 14 of the relay R weakens or neutralizes one of the coils 22 and strengthens the other and the relay armature r is shifted into engagement with one or the other of the contacts 24 in ac cordance with the polarity of the impulse.

A conductor 23 is connected to local battery 20 through a normally closed unlock ing switch V and conductor 19, and like wire 19, is shown in heavy lines and has a number of branches. Armature T, when shifted connects conductor 23 to one or the Specification of Letters Patent.

Patented May 27, 1919.

Divided and this application filed June 29,

other of a pair of conductors 25. The flow of current through conductors 25 selectively controls a set of selecting relays W W W and In the arrangement shown, there are two relays Vt and l and a number of pairs of transfer switches 14, u, u" and a are operated respectively by relays U U, and U" to successively connect the selecting relays W, \V and V to conductors 25 as the impulses of the permutation are received. The switches 11. of the transfer relay U are connected to the main local conductors The switches 14 of the second transfer relay U are connected by conductors 26 to the normally disengaged contacts of switches a. Similarly, the switches of the third and fourth transfer relays are connectcd to the normally disengaged contacts of the switches of the preceding transfer relay by conductors 26. A pair of branch conductors 31 and 31 lead from the normally engaged contacts of the first pair of transfer switches a to the coils of the relays \V'. a normally closed switch 10 being interposed in each of these branch conductors, and the second, third and fourth pairs of selecting relays VV and \V are similarly connected to the normally engaged contacts of the transfer switches u u." and w. respectively, by pairs of branch conductors 32 and 32, 33 and 33', and 34 and 34. Each selecting relay opens the normally closed switch in in the circuit of the other relay of the same pair, so that, when any one relay is operated, the circuit of the other relay of the same pair is opened. A fifth pair of branch conductors 35 and 35 are connected to the normally disengaged contacts of the transfer switches a.

Each of the selecting relays operates a pair of locking switches w and 10 that are connected to the battery wire 23. The contacts of the switches in are connected to the coils of the respective relays so that, when any one of these relays is energized, its circuit is held in closed condition. The switches w of selecting relays w are connected by conductors 36 to the coil of the corresponding transfer switch relay U so that, when either of the relays W is operated, relay U is also operated and its c ir cuit held in closed condition to shift switches a and hold them in shifted position. In

a similar manner, the operation of either one of the pairs of sch-.rting magnets Vi, W", or W" energizes the corresponding transl'er switch relay ll, ll or ll. The branch conductors 31, 32, 33 and 34. have extensions 31", 32, 33, and 34, leading to the contacts of a set of switches X of a relay X For the sake of elearness, all of the relays are shown as grounded on one side, but: it will be understood that, if desired, they could be connected to the local battery 20 by a suitable return Wire.

The first impulse of any permutation energizes line relay R and shifts its armature "r" in one or the other direction. Current will flow from local battery 20 by conductor 19, normally closed unlocking switch V, battery wire 23, armature 1" to one of the main conductors 25, thence by one of the switches a, to one of the branch conductors 31 or Ill, through the switch '10 therein, to the coil of one or the other of the first pair of selecting relays W and then back to local battery 20 through the ground or by a suitable return wire. If the first line impulse is positive, the selecting relay in branch cmnluctor 31 is energized and if negative, relay YV in the branch conductor 31 is energized and this branch conductor, together with its ex tension 31 thereof is locked in closed condition at this point. The operation of either of the relays W shifts the corresponding switches w, w and "w". Switch in cuts out the other relay of the pair and switch "Lt clOSes the locking circuit from battery wire 23 through the coil of the selected relay and this circuit is held closed independently of the line relay R. The switch w of either of relays W, closes the local battery circuit through the first transfer switch relay U by onnecting the battery wire 29 to conductor 36, and relay U then operates the transfer switches u to disconnect the first pair of branch conductors 31 and 31' from the main conductors 25 and connect the second pair of branch conductors 32 and 32' thereto through the second pair of transfer switches 11 and the conductors 26 that lead from the normally disengaged contacts of the switches a.

In a similar manner, the second line impulse shifts the line relay armature r in one or the other direction and closes the local operating circuit from the battery wire 23 and armature r to one of the main conduc tors 25 to one of the switches a, thence by one of the conductors 26 to one of the switches u and by branch conductors 32 or 32 to one or the other of the second pair of selecting and locking relays W which is thereby operated and its circuit locked in closed condition. The operation of either of these relays operates relay U and disconnects the branch conductors 32 and 32 from the main conductors 25 and connects the branch conductors 83 and 33 thereto, so that the third impulse of the pernuitatiou operates either one of the two magl'iets Vl and locks its circuit in closed condition. Similarly, the fourth impulse selects one of the relays W. The fifth impulse selects one of the bran h conductors 35 or 35. The selecting and locking relays or magnets thus connect one or more of the extension eonductors 31", 32", 33" and $54" and one o[ the conductors 35 or 35 to the local battery 2 as the signal is received, and the flow (ll tillh rent through the selected conductors controls the printing mechanism.

Preferably, as set forth in the application of Howard L. Krum, filed May 31, 1910, Serial No. 564,120, the set of transfer-switch and selecting relays are timed to operate in synrhrouism with the speed of transmission of the succeeding impulses of any permutntion or signal. That is to say, the signals are rapidly tr=msmitted without pauses or hreale between succeeding line impulses, and, when the operation of the elertor ii initiated by the first impulse of a permutation, the selecting and locking relays are surressively connected to the line relay as the succeeding impulses of the permutation are received and in synchronism therewith.

The printing mechanism comprises a type wheel ll nn'mnted on a short vertical shaft j. The latter is connected by an arm 1/ and a link 7/ to the core P of a striker magnet P. When the type Wheel is o cillated by magnet l, the arm P opens a normall closed switch r and thereby opens a locking circuit for the printer. The switch is also shifted by a release niaenet' ll. The type wheel is rotated by a shaft having a pinion thereon meshing with a segment 7 on a shaft Z (lrank arms Z on the shaft are connected by links to the cores L of a pair of magnets L and L which rotate the shaft Z in opposite directions. Operating magnets S, S and G effect the letter space, carriage return and line space operations respectively of the printer, and a pair of magnets H and H control the capital and figure shift mechanism.

The operation of the printer is effected by a set of controlling or actuating devices which correspond to and are in turn controlled by the set of selecting and locking relays W, W, W, W and W. Relay W controls a switch operating armature W". The other locking relays control a set of magnets N N N and N", the cores of which actuate switch operating members n and are connected by links 12 to a set of oscillating selector plates or disks n a a and a on the type wheel rotating shaft Z. A drum an axially movable on the shaft Z, carries a series of pins m which are yieldingly held in place by springs m that engage collars 'm thereon. The drum is shifted by a lever m" to project the stop pins through holes in the selector plates and into the path of an arm M on the shaft Z. In any setting of the selector plates, which are controlled by the first four impulses of each signal or permutation, two pins on opposite sides of the arm M are projected, and the type wheel actuating shaft Z is then rotated in one or the other direction in accordauce with the polarity of the fifth impulse of the signal, until arrested by the engagement of the arm with one of the pair of projected pins. Lever m is connected by a link in to the core of an operating magnet M The lever also controls a pair of contacts m and m The details of the printer are more fully set forth in the above noted application and need not be more fully described here.

The four conductors 31", 32", 33" and 3t are connected to the set of switches X and, as described, are variably selected by the first four impulses of any pernuitation. Switches X are connected respectively by conductors 36 to the magnets N N, N and N, so that the variable operation of the relays W, W, W and W variably se lects these operating magnets to effect the different settings of the selective plates or disks n, of, a and it. These magnets operate normally open locking switches a con nected to the coils of respective magnets and the contacts of which are connected to a branched conductor 37, shown in heavy lines in the diagram. This conductor forms a printer locking circuit and connects difierout parts of the printing apparatus to the local battery 20 through the normally closed unlocking switch r and the battery wire 19. When one of the operating magnets N N N and N is energized, this locking circuit is closed through its coil from battery 20 through wire 19, unlocking switch r, conductor 37. switch a of the selected magnet to the coil thereof and thence by ground or by a suitable return wire back to battery 20. If the first impulse of any permutation is negative, the first operating magnet N is energized and selector plate 11' moved to shifted position. If the first impulse is positive, magnet N is not energized and plate a remains in normal position. Similarly, the other selector plates n n and n are moved to shifted position or left in normal position, in accordance with the polarity of the second, third and fourth impulses of the permutation.

Magnets N, N N and N also control. a contracted fan circuit to select any one of a series of conductors 41, 42, 43 and 14 through the medium of a set of switches g 9 3 g and 1 Switch 3 of magnet N is connected by a conductor 38.to switcharm m that -is brought into engagement. with its oontactwz/i by the operation of pin shifter magnet M. Switch 1 of mag net N is connected to the normally engaged contact of switch 3 by a conductor 25$). Switch y of magnet N is connected to the normally engaged contact of switch y by a conductor 40. Switches 3 and y of magnet N are connected by conductors t5 and to to the contacts of switch 3 A conductor 41 is connected to the normally disengaged contacts of switches y, 2/ and A conductor is connected to the normally engaged Contact of switch f, and conductors l3 and it are connected to the contacts of switch y.

The fifth impulse of any permutation lects, as stated, one of the branch conductors 35 and 35, which are connected respectively to the norn'ially engaged contacts of two switches 01' and .11 operated by the magnet X. Switch m is connected by a conductor Li, a normally closed switch N" and a eonductor 48 to the coil of a selecting relay ll" which is thus energized whenever the tifth impulse is negative and selects conductors 35'. Switch a? is connected by a conductor 49 to the coil of the magnet M which operates the stop-pin carrier, and by a conductor 51 to the coil of the magnet X. The coils of magnets M and X are grounded or connected by return wire to local battery 20, and these magnets are thus energized when the fifth impulse is positive and closes the circuit through the branch conductor A normally disengaged contact of switch a is connected to local battery 20 by wire 15), unlocking switch I" and a branch of conductor 37, and when magnet X is operated, the local battery circuit is closed through magnet X and M and is held closed until opened by the shift of the unlocking switch 7'.

Relay \V, which, as stated, energized when the fifth impulse of any permutation is negative, shifts sw itch w and thereby disconnects its coil from conductor t7 and also shifts a lock switch to. Current then flows from battery by conductor 19, switch 1*, conductor 37, switch w and conductor 48 through the coil of relay W and back to battery by ground or by a suitable return. wire. Switch 10", when shifted, also closes a circuit from the battery by conductor 19, switch r c011 dnctor 3T, switches in and 20", a conductor 5;, and conductors 49 and 51 to the coils of magnet or relay X and magnet M These two magnets are thus operated when the fifth impulse of any signal is received, whether positive or negative.

The first four impulses of any per1nutation select one or more of the branch cX- tensions 31", 32", 33" and 84'. The looking switches 10 of the corresponding relays W W, \V and W connect the selected branch conductors to through the normally closed unlocking the local battery lit) switch V and conductor 23 of the selector locking circuit, and so that the selected relays thus remain energized independently of the line relay and until unlocking switch V is opened. Then, when magnet. X is decnergized and switches X are in engagement with their contacts, the selector actuator magnets N. N N and N are variably operated. The fifth impulse, as stated, if negative, operates magnet VV', and whether positire or negative, operates magnets X and M Locking switches a, m and w connect the magnets N, N N, N, X M and W to the local battery through the unlocking switch 1 and conductor 37 of the printer locking circuit, so that these magnets, when operated, remain energized independently of the line relay and of the selectin magnets W VV W and W until unlocking switch r is opened by striker ma met I or leasing magnet ll. hen magnet l 1 is operated by thefifth impulse of any permutation. a circuit is closed from local battery 20, conductor 19, switch r, conductor 37, switch a to conductor 51 and thence. by a conductor 52' to a normally open switch u of the fourth transfer switch relay U. At this time, relay U is energized and the circuit is further traced from switch u by a conductor 51 through the coil of unlocking magnet V and back to local battery by ground or by a return wire. Unlocking switch V is then opened to disconnect the conductor 23 of the selector locking circuit from local battery, and the selecting and locking relays W, Vi, W and W return to normal condi tion and are ready to receive the next signal or permutation. Switch V also returns to normal condition, since the circuit through magnet V is opened when the relays W and U are dei nergized. But the selecting and locking relay W", operated, the selected actuating magnets N N, N, relay X and magnet M remain energized, since they are connected to battery through unlocking switch 1" of the printer locking circuit.

Magnet M shifts the pin carrier to project two of the pins 1% through the selector plates n, 11. n and n, in accordance with the setting of these plates. At the same time, switch cont-acts m and m are engaged and a circuit closed from battery 20, by conductor 19, unlocking switch 1*, battery wire 37, switch m of magnet X conductors 49 and 50, contacts a and n to conductor 38, thence through the set of switches y, y, y". u and y to one of conductors 41, 42, 43 and 4.4, in accordance with the varied operation of the magnets N N, N and N. Conductor 41 is connected to a switch 3 of magnet W and, if a character is to be printed, it circuit is closed through this conductor to switch 3 and by one or the other of a pair of conductors 55 and 56 in accordance with the polarity of the last impulse of the perimitation, which operates relay W, only it' it is negative. Thence the circuit is traced to one of the rotating magnets I) or I/ and thence by a common conductor 57 to the coil of a relay L and back to battery by ground or by a return wire. ()nc oi the magnets l, or L is thus operated to rotate the type-adjust ing shaft Z in one or the other direction until stop-arm M engages one of the projected stop pins m, to bring the selected type on whccl ll opposite the. printing point. At the same time, relay I) is energizcd and shifts two switches Z and l and a circuit is closed from battery 20 by con ductor 1t), unlocking switch 1". conductor 37, switch Z and a conductor 58 through the coil of 'lcttcr-space magnet H, thence by :tconductor 5!), switch I. a conductor (it) through the coil of striker magnet l and back to battery by ground or by a return wire. lilagnet i then shifts typwwhcel [l to print the lectcd type. and arm 7') opens the lo king swittll contacts r and 7" to disconnect the printer locking circuit cOlHll'lCtnr 37 From battery. All parts of the printing apparatus then return to normal position.

The fifth impulse of any ermntation causes the operation oi magnet X and thereby disconnects the printer from the selector. At the same time, magnet V is energized to open unlocking switch V, and the selector, except the selecting and locking relay W is restored to normal condition, but the printer locking circuit is not broken, since it is connected to the local battery through unlocking switch 9*. Therefore, as soon as the fifth impulse of any pern'lutation is received, the selecting circuits and relays W W Vi and W are in condition to receive the first four impulses of the next signal before the printing apparatus completes its operation. It is only necessary that unlocking switch 1" shall break the circuit of magnet X and permit its switches ac and m to drop back into engagen'ient with their back contacts before the fifth impulse of the next signal is received. In other words, the next signal may be built up while the character corresponding to the signal just received is being printed. When the operation of the printing apparatus is completed, switch r is opened, the magnet X is denergized, so that the switches controlled thereby drop back into enga ement with their contacts. Magnets N N and N are then properly operated in accordance with the signal that has been built up by the selective operation of the relays W W, W and W, and switches .10 and :12 are in proper position to receive the fifth impulse that selects one of the conductors 35 or 35' and the printing apparatus is operated, as before, to print the character corresponding to the signal. As the magnets which operate the printing apparatus, particularly the rotating magnets L and L striking magnet P and letter-space magnet S are necessarily strong magnets and somewhat Slow in operation, this separation of the selector and printer, by what may be termed the dividing magnet X greatly increases the speed at which the signals may be received and the corresponding characters printed.

As set forth in the above noted application, the switches 1 y y, 3 and 9 connect the conductor 38 to one of a set of conductors 41, 42, 43 and 4+ in accordance with the varied operation of the magnets N N, N, and N and the local battery is connected to the selected conductor when contacts m" and m are engaged by the opera tion of the magnet M These conductors lead to a set of switches y, y, 7 and y of the selecting and locking relay V and which remain in normal position or are shifted in accordance with the polarity of the last impulse of the permutation. Twenty six of the possible thirty-two permutations select the conductor 41 and one of the other of the conductors 55 and 56 and operate one or the other of the rotating magnets L or L The remaining six permutations select one of a set of six conductors leading from the contacts of the switches 3 3 and y. A selection of conductor 61 closes a circuit through the line space magnet G and thence by conductors 69 and 68 through releasing magnet R. If conductor 63 is selected, the circuit is closed through a resistance coil R conductor 57 and relay L which operates as described, to close the circuit of the letter space magnet S and striker magnet P to thereby print the center letter on the type wheel. The selection of conductor 64 closes a circuit through the letter space magnet S, conductor 59, switch Z, and conductor 67 and resistance coil R and thence by a conductor 68 through the releasing magnet R, to thereby form the spaces between words. If conductor 65 is selected a circuitis closed through the carriage wheel magnet S thence by a conductor 70 through a releasing magnet H and thence by conductors 71, 67 and 68 through a releasing magnet R. Resistance coils R and R prevent the operation of the releasing magnet R before the letter spacing and striking operations are completed.

The conductors 62 and 66 control the capital and figure shift magnets H and H The selection of conductor 66 closes a circuit through a normally closed switch it of magnet H and through the normally closed switch it of magnet H and through the coil of the latter magnet. The selection of conductor 62 closes a circuit through the switch a of magnet H and switch 71 of magnet H and through the coil of the magnet H Each of these magnets has a locking switch h connected to the coils thereof and the contacts of which are connected by a conductor 72 to the normally closed unlocking switch k of the releasing magnet H 'hcn the shift magnet H is operated, it shifts its switch 72f and the circuit is closed from conductor 62 through switch k of magnet H and through switch it of magnet H to conductors 73 and 67, through resistance R and by conductor 68 through releasing magnet R. Similarly, when the shift magnet H is energized, the circuit is closed from conductor 66 through switch h of magnet H and switch k of magnet H through conductors 73 and 67, resistance R, conductor 68 and releasing magnet R. The selected shift magnet also remains energized, since the locking circuit is closed through its coil by one of the switches It. Thus if magnet H is operated, the locking circuit is closed through its coil from battery wire ll), un locking switch It, conductor 72, locking switch It and "through the coil of magnet H. The releasing magnet H which operates the unlocking switch it has it coil connected by conductors 74 to the normally disengaged contacts of the switches h so that, when one of the conductors 62 or 66 is selected to operate one of the shift mag net, the other conductor is connected by one of the switches h to the coil of relay H Then, if this other conductor is selected, it does not operate its shift magnet but instead, operates the releasing magnet H In this way, by sending two permutations in one order or another, either the capital or the figure shift mechanism can be operated and released. That is to say, conductor 62 is selected by one special permutation or signal representing, for example, the capital shift, and conductor 66 is selected by another special permutation or signal representing the figure shift. If the capital shift signal is sent over the line, it will select conductor 62, operate shift magnet H and connect conductor 66 to the releasing magnet H If, then, the figure shift signal or permutation is transmitted, it operates the releasing magnet H and restores the shift mechanism to normal. On the other hand, if the figure shift signal is first transmitted, it selects the conductor 66, operates figure shift magnet H and connects the release magnet H to the conductor 62, so that, under such circumstances, the shift mechanism is released by transmitting the capital shift signal. In this way, by the use of two special signals only, either the capital or the figure shift mechanism can be operated and maintained in operative condition as long as desired and then released. The shift magnets H and H are provided with switch operating armaturcs h and the magnets H and L are provided with operating armatures h and Z respectively.

llU

It is obvious that changes may be made in the details set forth Without departure from the essentials of the invention as de fined in the claims.

*0 claim as our invention:

1. In printing telegraphs in which the signals are represented by ermutations of a definite number of modi ed line impulses, the combination of a printer, a set of selecting devices controlling all operations of said printer, a line circuit, means for bringing said selecting devices successively into operative relation with the line circuit as the impulses of each signal are received, means for maintaining said selecting devices in changed condition independently of the line circuit, and means for freeing a portion only of said set of selecting devices for further operation before the operation of said printer is completed.

2. In printing telegraphs in which the signals are represented by permutations of a definite number of different line conditions, the combination of a printer, a set of selectors cooperating to control all operations of said printer, a corresponding set of selecting and locking magnets responsive, respectively, to the successive impulses of the permutations for controlling the operation of said selectors, means for successively bringing said selecting and lockin magnets into operative relation with the hue as the impulses of each signal are received, and means for releasing a portion only of said set of selecting and locking magnets for further operation before the operation of said printer is completed.

3. In printing tclegraphs in Which the signals are represented by permutations of a definite number of different line conditions. the combination with a line circuit, of a recording mechanism, a set of selecting and locking magnets corresponding in number to the mnnber of difi'erent line conditions of each signal and arranged to control all operations of said recording mechanism, means for successively bringing said selecting and locking magnets into operative relation with the line circuit as the impulses of each signal are received, means for maintaining said magnet in changed condition independently of the line circuit, means acting at the end of each signal for releasing a portion only of said magnets for each succeeding selecting operation before the operation of the printer is completed, and means acting at the end of the printing op eration for releasing the remaining of said magpcts.

4. In printing telegraphs in Which the signals are represented by permutations of a definite number of modified line impulses, the combination With a line circuit, of a printer, a set of selecting and locking magnets, means for successively bringing said set of magnets into operative relation with the line as the impulses of each signal are received, a locking-circuit for a portion of said selecting and locking magnets, a second locking circuit for the remainder of said magnets and for said printer, and means for successively opening said locking circuits.

In printing telcgraphs in which the signals are represented by permutations of a definite number of modified line impulses, the combination of a line circuit, of a recording mechanism, a set of operating selectors controlling all operations of said recording mechanism, a corresponding set of electric selecting devices for controlling said operating selectors, means for successively bringing said electric selector devices into operative relation with the line circuit as the impulses of each signal are received, means for placing a portion only of said electric selecting devices in condition for further operation before the operation of said recording mechanism is completed, and means for subsequently placing the remainder of said selecting devices and said printer in condition for further operation.

6. In printing telegraphs in which the signals are represented by permutations of a definite number of modified line conditions, the combination with a line circuit, of a recording mechanism, a set of selecting circuits, a corresponding set of circuits controlled, respectively, by said selecting circuits and arranged to effect all operations of said printer, means for successively bringing said set of selecting circuits into operative relation with the line circuit as the impulses of each signal are received, and automatic switch mechanism for disconnect ing a portion only of said selecting and operating circuits before the operation of said printer is completed.

7. In printing tclegraphs in which the signals are represented by permutations of a definite number of impulses of opposite polarity, the combination of a recording mechanism, a set of selectors variably operated in different combinations for controlling the operation of said, recording mechanism, means initiated in operation by the first impulse of each signal, but otherwise locally controlled, for bringing said selecting devices successively into operative relation with the line as the impulses of each signal are received, and means for placing said selecting devices in condition for further operation before the operation of said recording mechanism is completed.

8. In printing telegraphs in which the signals are represented by permutations of a definite number of different line conditions, the combination of a printer comprising a type Wheel, striker mechanism, a

series of stop devices for arresting said type Wheel. and :1 set of operating selectors for controlling said type Wheel stop devices and said striker mechanism, and a set of electric selecting deYiees corresponding to and controlling' said set of operating selectors and responsive, respectively, to the successive iine conditions of the signals, said eleetrie selecting devices being operative to nntmte the selertion of a character before said type 10 Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

